[Objective] With a strain of endophytic antagonistic bacteria with good disease control efficacy in pot as trial material,the paper was to explore the antagonistic mechanism of siderophore against Fusarium oxysporum.[...
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[Objective] With a strain of endophytic antagonistic bacteria with good disease control efficacy in pot as trial material,the paper was to explore the antagonistic mechanism of siderophore against Fusarium oxysporum.[Method] Whether the strain produced siderophore and its fluorescent property was judged by MSA（Modified Sugar-Aspartic acid） *** siderophore activity of strains in liquid MSA medium was determined through the absorbance values at particular *** inhibition effects of it siderophore against *** under different concentrations of Fe3＋ were *** the strain was preliminarily identified based on morphological,physiological and biochemical characteristics [Result] The fluorescent siderophore produced by the endophytic bacteria in MSA medium had a strong inhibition effect against *** the increasing concentration of Fe3＋,the inhibition effect against the pathogen *** preliminary analysis showed these strains belonged to Bacillus.[Conclusion] Bacillus could compete the absorption of Fe3＋ by secreting siderophore to inhibit the growth of ***.
[Objective] The aim was to study the germination behavior of Tamarix elongata *** natural conditions.[Method] By using *** as the experimental materials,the seed morphology and germination characteristics were observe...
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[Objective] The aim was to study the germination behavior of Tamarix elongata *** natural conditions.[Method] By using *** as the experimental materials,the seed morphology and germination characteristics were observed and measured.[Result] ① *** seed was 1 011.96 μm in length and 399.94 μm in width,and the thousand-seed weight was 38.66 mg;② the germination rate,germination energy,germination index and germination coefficient of *** seeds were 95.56%,46.67%,20.25 and 56.86 respectively;③ there were no significant differences in morphology and germination characteristics among the three different geographical populations.[Conclusion] The present research will provide reference for the introduction and breeding of *** as well as the protection of sand dune vegetation.
2009年在四川攀西地区发现一种毁灭性的石榴新病害,且有逐年加重的趋势,此病害将可能成为该地区石榴生产上巨大的潜在威胁。通过对病株的症状观察,病原菌的分离、培养形状、显微特征观察,并采用柯赫氏法试验,明确了该病原菌是由甘薯长喙壳Ceratocystis fimbriata Ellis et Halsted引起的石榴枯萎病。该病害是除印度和中国云南蒙自石榴产区外,在四川省石榴产区为首次报道。
2009年在四川攀西地区发现一种毁灭性的石榴新病害,且有逐年加重的趋势,此病害将可能成为该地区石榴生产上巨大的潜在威胁.通过对病株的症状观察,病原菌的分离、培养形状、显微特征观察,并采用柯赫氏法试验,明确了该病原菌是由甘薯长喙壳Ceratocystis fimbriata Ellis et Halsted引起的石榴枯萎病.该病害是除印度和中国云南蒙自石榴产区外,在四川省石榴产区为首次报道.
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